Automatic balance attachment for delivery-valves of air-compressors and water-pumps



(NoModeL) S. B CONNOR 82; H. DODS.

Alitomatio Balance Attachment for Delivery ValveS of Air Compressors and Water Pumps.

No. 232,939. Patented Oct. 5,1880.

k g lg WITNESSES: INV'ENTOR:

a. JJ? 5% ATTORNEYS.

N.PE!ERS. PNOYO-L|THoGRAPHEm WASHINGTON n C Nrrnn Starts PATENT rarest SAMUEL B. CONNOR AND HENRY DODS, OF VIRGINIA CITY, NEVADA.

AUTOMATIC BALANCE ATTACHMENT FOR DELIVERY-VALVES 0F AIR-COMPRESSORS AND WATER-PUMPS.

SPECIFICATION forming part of Letters Patent No. 232,939, dated October 5, 1880,

Application filed July 13, 1880.

To all whom it may concern:

Be it known that we, SAMUEL CONNOR and HENRY Dons, of Virginia City, in the county of Storey and State of Nevada, have invented a new and Improved Automatic Bal ance Attachment to Delivery-Valves of Air- (Jompressors and ater-Pumps, of which the following is a specification.

It is well known that in all air-compressors and water-pumps the pressure in cylinder of air-compressorsorin working barrel or cylinder of pumps is much greater at the point of openin g the delivery-valves than the actual press ure in air-receivers of compressors or water-column of pumps, because of the difference in area between the top and bottom of delivery-valves. In some air-compressors a hundred and twentytive pounds pressure to the square inch required in the cylinder to eighty pounds in the receiver, and in some instances a hundred pounds pressure is required in the cylinder to eighty pounds pressure in the receiver or column.

The object of thisinvention is to remedy this defect in air compressors and pumps, to provide a device whereby the compressors and pumps can operate with equal pressure on both sides of the delivery-valve.

The invention consists of an auxiliary valve arranged outside of the cylinder, where itshall not be subjected to back-pressure, and connected with the deliverywalve by a hollow valve-stem.

The drawing represents a vertical sectional elevation of the device.

In the drawing, A represents the (,ylnlue. of an air-compressor in which there is a piston. (Not shown.) B is the ring on the end of the cylinder A, containing the deliveryports I) I), through which the air from the cylinder A is forced into a receiver or conducting-pipes. (Not shown.) This ring B is provided with an inner flange or valve-seat, 0, on which rests the delivery-valve O. D is the cylinder-head. These parts are similar to those seen in some of the air-compressors in common use, and with such construction and arrangement one hundred pounds pressure to the square inch in the cylinder A is required to open the valve 0 against eighty pounds (No model.)

pressure in the receiver or in the conductingpipes.

By means of the standards E E we connect a drum, F, having an open end, to the cylinder-head D, and within this drum F we place a valve, Gr, parallel with the valve 0, and connect the two valves 0 G by means of a rod, H, that extends from the inner face of the valve (J centrally through the cylii'lder-head D, and suitable stuffing-box and gland f g, respectively, and centrally through the-bottom of the drum F and its stuffingbox and gland h i, respectively, into and through the valve G, and on the outer end of this rod H is screwed an adjustin g-nut, I, by means of which the valve G may be adjusted on its seat 8, the bottom of the drum F. This rod H is provided with a longitudinal bore, m, that extends from its inner end, within the cylinder A, to a point on a level with the face of the valve-seat s of the drum F, and at this point the said bore m is intersected by a lateral opening, a, that opens into the space between the valve G and its seat 8.

It will be seen that the upper face of the valve G is exposed so as to be subjected to atmospheric pressure only. Hence when the compressor is in operation a portion of the air in the cylinder A passes through the rod H into the space beneath the valve G, and there exerts sufficient pressure, in combination with the pressure on the inner face of the valve G, to open said valve G against an equal pressure in the receiver or conducting-pipes. euce when the pressure in the cylinderA reaches the pressure-point in the receivers the valve 0 is opened and held in place until the piston in said cylinder A starts on the return stroke, when the pressure under the valve G is immediately exhausted through the rod 11 and the main valve 0 closes.

The space between the valve G and its seat 8 should be as shallow as possible, that said space may be quickly filled and exhausted of air, and the valve G may be adjusted to regulate saidspace by being screwed on the rod H and held by nut I.

Having thus described our invention, we claim as new, and desire to secure by Letters Patent- 1. An automatic balance attachment to delivery-valves of air-compressors and waterpumps, constructed substantially as herein shown and described, consisting ofthe valve 5 G, within the drum F, connected with the de livery-valve O by the hollow rod H, as set forth.

' 2. The combination, with the delivery-valve O of an air-compressor or water-pump, of an auxiliary valve, Gr, connected therewith by a 10 hollow rod H, substantially as herein shown and described, the inner face of said auxiliary valve being subjected to the air or water pressure of the air-compressor or water-pump cylinder, while its outer face is subjected to atmospheric pressure only, as set forth.

SAMUEL BARTLETT CONNOR. HENRY DODS. WVitnesses W. E. SHARON, O. G. RECORD. 

